Genyocerus quadriporus (Schedl)

Beaver, R. A. & L. - Y, 2007, A review of the genus Genyocerus Motschulsky (Coleoptera: Curculionidae: Platypodinae), with new synonyms and keys to species, Zootaxa 1576 (1), pp. 25-56 : 39

Genyocerus quadriporus (Schedl)

( Figs 27 –29)

Diacavus quadriporus Schedl, 1942: 217 .

Diacavus quadridens Browne, 1962: 218 . n. syn.

Diacavus compactus Schedl, 1966: 40 . n. syn.

Diacavus compactus dubiosus Schedl, 1966: 41 . n. syn.

Diacavus quadrifoveolatus Schedl, 1970: 369 . n. syn.

Taxonomy: We have compared the male holotype, female allotype and a female paratype of D. quadriporus (NMW) , a male paratype of D. quadrifoveolatus (NMW) , 2 male and 4 female paratypes of D. compactus (NMW) and the male lectotype and a female labelled as 'allotype’ of D. compactus ssp. dubiosus (NMW) with a series of specimens of both sexes in RAB's collection from Malaysia and Thailand, which had earlier been compared with paratypes of D. quadridens (BMNH) . The species form a series that is continuously variable in size but without specifically distinct characters in either sex. Males vary from 2.5–3.2 mm long, females from 2.7–3.4 mm long. The subspecies dubiosus is simply a small form of the species and not subspecifically distinct. The form described as D. quadrifoveolatus represents the other extreme in size. Schedl (1963) synonymised D. quadridens with D. philippinensis , stating that the species agree in all particulars. This is incorrect. As indicated above, D. philippinensis is conspecific with D. diaphanus , a species that is not very closely related to D. quadridens .

Distribution: The species is recorded from West Malaysia, East Malaysia (Sabah, Sarawak), Sumatra, Thailand and the Philippines. It has been intercepted in Japan and South Korea in timber exported from the region.

Biology: All recorded host trees are members of the family Dipterocarpaceae ( Anisoptera , Dipterocarpus , Dryobalanops , Shorea ).

Figures

PLATE 8. FIGURE 26. Genyocerus quadriporus (Schedl) dorsal view of male elytra. FIGURE 27. Genyocerus quadriporus (Schedl) lateral view of male elytra. FIGURE 28. Genyocerus quadriporus (Schedl) dorsal view of female.